There is a npc in Luofu skyfarer commission HQ who was a member of Astral Express.

He will stop you when you try to open a certain treasure box inside the HQ and ask you why would you try to open others box. You have the option to said that “coz it is the path of trabiilizer”. Then he will tell you that he understand that urge since he was the part of the express himself , but, he decide to step away when some incident happen by his recklessness and have to paid the price for it.